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0e5e04b89a
On type error of closure call argument, point at earlier calls that affected inference Mitigate part of https://github.com/rust-lang/rust/issues/71209. When we encounter a type error on a specific argument of a closure call argument, where the closure's definition doesn't have a type specified, look for other calls of the closure to try and find the specific call that cased that argument to be inferred of the expected type. ``` error[E0308]: mismatched types --> $DIR/unboxed-closures-type-mismatch.rs:30:18 | LL | identity(1u16); | -------- ^^^^ expected `u8`, found `u16` | | | arguments to this function are incorrect | note: expected because the closure was earlier called with an argument of type `u8` --> $DIR/unboxed-closures-type-mismatch.rs:29:18 | LL | identity(1u8); | -------- ^^^ expected because this argument is of type `u8` | | | in this closure call note: closure parameter defined here --> $DIR/unboxed-closures-type-mismatch.rs:28:25 | LL | let identity = |x| x; | ^ help: change the type of the numeric literal from `u16` to `u8` | LL | identity(1u8); | ~~ ```